International Journal of High-Rise Buildings (국제초고층학회논문집)
- Volume 3 Issue 4
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- Pages.255-271
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- 2014
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- 2234-7224(pISSN)
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- 2288-9930(eISSN)
DOI QR Code
Smart System Identification of Super High-Rise Buildings using Limited Vibration Data during the 2011 Tohoku Earthquake
- Ikeda, A. (Department of Architecture and Architectural Engineering, Kyoto University) ;
- Minami, Y. (Department of Architecture and Architectural Engineering, Kyoto University) ;
- Fujita, K. (Department of Architecture and Architectural Engineering, Kyoto University) ;
- Takewaki, I. (Department of Architecture and Architectural Engineering, Kyoto University)
- Published : 2014.12.31
Abstract
A method of smart system identification of super high-rise buildings is proposed in which super high-rise buildings are modeled by a shear-bending system. The method is aimed at finding the story shear and bending stiffnesses of a specific story only from the horizontal floor accelerations. The proposed method uses a set of closed-form expressions for the story shear and bending stiffnesses in terms of the limited floor accelerations and utilizes a reduced shear-bending system with the same number of elements as the observation points. A difficulty of prediction of an unstable specific function in a low frequency range can be overcome by introducing an ARX model and discussing its relation with the Taylor series expansion coefficients of a transfer function. It is demonstrated that the shear-bending system can simulate the vibration records with a reasonable accuracy. It is also shown that the vibration records at two super high-rise buildings during the 2011 Tohoku (Japan) earthquake can be simulated with the proposed method including a technique of inserting degrees of freedom between the vibration recording points. Finally it is discussed further that the time-varying identification of fundamental natural period and stiffnesses can be conducted by setting an appropriate duration of evaluation in the batch least-squares method.
Keywords
- System identification;
- Structural health monitoring;
- Shear-bending model;
- High-rise building;
- ARX model;
- 2011 Tohoku earthquake;
- Time-varying identification